Commission

Does not have a specific legal meaning. It generally refers to a body given the responsibility to inquire into certain matters, or to make decisions or recommendations. A commission will not usually be a large body. It is possible to have a constitutional commission to make detailed proposals for constitutional change, though such a commission would not be able to adopt the constitution for a country. In many countries there are commissions for various purposes (human rights investigations and election management are common examples), which are somewhat— even very—independent from the government. The constitution will often guarantee this.